I found this:
The E1 error code on your Gourmia air fryer usually indicates a problem with the temperature sensor. This error code is often triggered when the air fryer's temperature sensor fails to detect a temperature reading.
Here are a few troubleshooting steps you can try to resolve the E1 error code on your Gourmia air fryer:
# Unplug the air fryer from the power source and wait for a few minutes before plugging it back in. This can help to reset the system and may clear the error code.
# Check to make sure that the temperature probe is securely plugged into the air fryer's socket. If it is loose, try unplugging it and plugging it back in firmly.
# Ensure that the temperature probe is clean and free from any debris or damage. If it is dirty, gently clean it with a soft cloth or brush.
If all of this does not solve it, then a repair is required and the sensor need to be replaced.